William bruckner



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IMPROVED Funnier. ron nssuirsumzme oars.

SPECIFICA'TIQ'N.-

TO ALL TO wHoM THESE PRESENTS SHALL comm:

Be it known that 1, WILLIAM BRiieKNER, of the city and county of San Francisco, State of California, have invented a new and improved Furnace for Roasting Ores; and Ido hereby declare that the within is a full and exact deseription'of the construction andtiperation of the same, reference being had to the drawings,wi-th letters marked -thereon, in which- Figural is a side elevation.

Figure 2 isa sectional end view of the furnace, showing the opening and grate.

Figure 3 is an enlarged end view of the cylinder.

Figure 4 is a sectional end view. I

Figure 5 is a sectional side view, showing the lining of brick.

The same letters indicate like parts in all the figures.

l I I am wellaware that furnaces forroasting sulphuretted ores havebeen erected with great care and at large expen'se, someof them embodying principles of a highly scientific character, but none, I believe, combining cheapness and simplicity in construction with utility and efficiency of operation to; that extent which characterizes my invention. The reduction of sulphuretted ores by the roasting process has been and now is considered one i of themost diflicult tasks which the metallurgist has to encounter, not only to prevent the precious metals from passing away with the fumes and smoked the sulphur, arsenic, antimony, and other substances which adhere .so' closely, and so obstinately refuse, by reason of their intimate connection .with the metals, to yield to treatment for. their separation, but the dificulty which there is in arranging the furnace so that the charge of ore 1- to jberoasted shall more frequently present a new surface to the oxidizing influence of the heat and atmosphere, andthe heat be more evenly difi'used throughout the whole mass of the ore which is to be'submitted to the roasting process. These are some of the obstacles which are to be overcome; and it is confidently believed that, by the proper use of my furnace, these difliculties have in a great measure been overcome. I

From careful and correct experiments made in roasting five tons of ore with four reverberatory furnaces, at Virginia City, Nevada, the following results havebeen deduced:

nossrme FIVE 'TONS OF one In TWENTY-FOUR HOURS IN roUn'nEvnRBERAroI w FURNACES: 'For1'2 men,'$35 0............ .,$42-00 For 3% cords. of wood, $12 42 00 For500lbs.salt 00 Total. t. e109 00-Cois'tperton .se so nossrme FIVE TONS or one IN TWELVE nouns IN- rwo 0F BR'I'IcKNEns runnscns, wrrn om: MAN,

oos'rs AS roLLows:

Forlman $350 For 2 cords woo'd 24 00 For 500 1bs. salt 25 00 Moving-power, 7 per cent. of a -horse power engine 3 Total 00-'C ostofroasting,perton .1120

6 Showing a'saving, per ton, with Briickner's furnace @310 The nature of my invention consists in providing a horizontal cylinder with screws, or rifles, placed upon the inside, which alternately serve todrive the ore from one end to the other, and evenly -presenting-the mass of f ore to the heat and atmosphere, the whole being revolved by means of chains and pulleys.

. To enable others skilled in the art to make and use my invention, Iwill proceed to describe its construction and operation. 1 a V I construct my cylinder of iron or other material, with flanges and headplates strongly b'olted together at each end, of the desired dimensions-say for roasting one-half ten of ore, eight feet long, and three feet inside diameter, after the fire-brick lining is introduced. I place in or construct with the brick lining, two screwsot rifles, made of fire-brick or iron, and placed diagonally and at opposite ends and sides; by this arrangement the r, ore is constantly driven from one end to the other of the cylinder, and a new surface is presented to the action of the heat and atmosphere. The position of the screws is such, that they assist in discharging the ore after it isroasted, which is accomplished by opening the discharge door, and after a few revolutions 'of the'cylinder, it is entirely discharged. The fireplace and discharge-chimney are built of brick or stone, with funnels suf ficiently large, so that each end of the cylinder may easily fit and revolve. I place a pipe over the dischargechimney, of any. height desired, upon-which a condenser may be used, for the purpose of condensing the smoke andfumes if necessary. Upon a framework ,of wood, over the cylinder, I place a horizontal shaft, with chain pulley, and endless chains passing around the cylinder in raised grooves. I also place rollers attached to each of the four posts of. the frame, upon which the cylinder revolves, near its lower periphery, and which serve to steady it as well as to assist in rotating, also that it may not bear too heavily upon the furnace heads and chains. The ore and saltare introduced into the cylinder by means of a sliding door, after which the door is closed, and the fire placed in the furnace. For fuel, I use wood and coal. The cylinder is to be revolved by steam or man power-eneman can easily turn.it-at.the rate of from twenty to thirty revolutions per hour. About four hours are consumed in roasting one charge in myfurnace, although difi'erent classes of ore need a different space of time for their treatment.

In the accompanying drawings, A represents the furnace; a is the grate; B is a funnel through which the fumes and smoke may pass off; Ois the cylinder, suspended by endless chains, 6 b, from the chain pulleys old, on the shaft c e e are rollers placed upon each side of the cylinder, for the purpose of steadying it, and also-to assist in rotating; h is a charge and discharge hole to the cylinder, which is closed by the-slidin'gdoor i Z is a small hole made about the fire-place in front of the heat-pipe f, (shown at figs. 2 and 3 g is the opposite pipe, I

throughwhichthe smoke and fumes (shown at fig. 5;) K K K are screws or rifles for the purpose of driving the mass of ore from one end of the cylinder to the other, (shown at figs. 4 and 5.) The screws or rifles, K K, in

the cylinder 0, are made spiral in opposite directions, to convey the charge alternately in each direction, and heat it uniformly. L Lrepresent the brick lining, (also shown at figs. 4 and 5;) M M arethe wood framework: P is a pulley, (shown at fig. 1.)

Having thus described my invention, I do not claim, broadly, a revolving furnace or cyli'nder, with shelves placed horizo ntally, across its inner surface, for the purpose'of roasting ores, for this device is known;'but what I claim as my invention and improvement iii-rotating cylinders for roasting ores is i The internal screw ribs or rifles, arranged spirally in opposite directions, so as to convey-the ore alternately from end to-end of the cylinder, and heat it uniformly.

WILLIAM BRUCKNER, Witnesses:

J. G.'Hurcnmson, O. W. SMITH.

was; 

